<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="css/main.css">
    <link rel="stylesheet" href="css/button.css">
</head>
<body>

<div class="login-box">
    <h2>登陆系统</h2>
    <form action="#" method="get">
        <div class="user-box">
            <input type="text" name="username" required>
            <label>用户名</label>
        </div>
        <div class="user-box">
            <input type="text" name="password" required>
            <label>密码</label>
            <h5 style="color:deeppink">用户名或密码错误</h5>
        </div>

        <button type="submit">
            <span></span>
            <span></span>
            <span></span>
            <span></span>
            登录
        </button>

    </form>
</div>
</body>
</html>